| 摘要 |
PROBLEM TO BE SOLVED: To always preferably conduct variable speed forced end control by accurately detecting that shift does not progress as designated due to lowering of torque during drive down-shift operation. SOLUTION: When down-shift is determined to be in progress in the step 21 and the drive state is determined in the step 22, the drive down-shift is determined to be in progress, and it is determined whether inertia phase is started or not in the step 23. When the start of inertia phase is determined, the inertia phase control of the drive down-shift is started in the step 24. While the inertia phase control for the drive down-shift is determined to be in progress in the step 25, when the difference (change ratio of transmission input rotating speed) ΔNt between the preceding read value of a turbine rotating speed Nt and this time read value is determined to be less than a positive very small value ΔNts in the step 26, and the transmission input torque Tt is determined to be less than a preset value Tts in the step 27, it is determined that lowering of torque due to accelerator back during the drive down-shift operation is caused in the step 28. Accordingly, a phenomenon that although the input torque Tt exceeds the preset value Tts, the change ratio ΔNt of the input rotating speed is less than the preset value ΔNts is not wrongly determined to be lowering of torque, and at that time the variable speed forced end control is conducted to prevent worsening of shock. |
